IPA: /ɪnəʊˈzɜːrvəns/
KK: /ɪnˈɑːbɚvəns/
The act of not paying attention to something or not following a rule or custom.
His inobservance of the safety regulations led to an accident at work.
Inobservance → It is formed from "in-" (meaning not) and "observance" (from Latin "observantia", meaning the act of observing or following). The word refers to the state of not observing or failing to follow rules or customs.
Think of 'not' ('in-') following or 'observing' something — that's why inobservance means failing to observe rules or customs.